Radiation-grafting of 4-vinylpyridine and N-isopropylacrylamide onto polypropylene to give novel pH and thermo-sensitive films
Abstract:
Here 4-vinylpyridine (4VP) was grafted onto polypropylene films (PP) by mutual irradiation method to give PP-g-4VP; N-isopropylacrylamide (NIPAAm) was then grafted onto the PP-g-4VP films to give (PP-g-4VP)-g-NIPAAm by pre-irradiation method, using a 60Co γ-source. The dependence of grafting percentage on radiation dose, temperature, reaction time, and monomer concentration was studied. (PP-g-4VP)-g-NIPAAm films were characterized by infrared spectroscopy (FTIR-ATR), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The critical pH point and lower critical solution temperature (LCST) were determined by swelling and water contact angle measurements. The LCST also was determined by DSC. The binary graft copolymer films are shown to be thermo-pH sensitive. © 2008 Elsevier Ltd. All rights reserved.
Año de publicación:
2009
Keywords:
- 4-Vinylpyridine (4VP)
- N-isopropylacrylamide (NIPAAm)
- pH critical
- Radiation grafting
- Polypropylene (PP)
- Lcst
Fuente:
Tipo de documento:
Article
Estado:
Acceso restringido
Áreas de conocimiento:
- Polímero
- Polímero
- Ciencia de materiales
Áreas temáticas:
- Química orgánica
- Química y ciencias afines
- Tecnología de otros productos orgánicos